An international team, led by researchers at Monash University in Australia, found that globally more than five million extra deaths a year can be attributed to non-optimal temperatures.
Several parts of the country recorded temperatures over 40 degrees Celsius earlier this week
The heatwave is at its peak in the national capital and some other areas and relief is expected later this week, an IMD official said
Over 30% of weather-related deaths in US are attributable to high outdoor temperatures or sunstroke